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<head>
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    <title>Document</title>
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    <link rel="stylesheet" href="./css/main.css">
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<body>
    <header>
        <a href="./login.html">退出</a>
    </header>
    <div class="wrapper">
        <div class="sider">
            <ul class="layui-nav layui-nav-tree" lay-filter="test">
                  <!-- <li class="layui-nav-item layui-nav-itemed">
                    <a href="javascript:;">默认展开</a>
                    <dl class="layui-nav-child">
                      <dd><a href="javascript:;">选项1</a></dd>
                      <dd><a href="javascript:;">选项2</a></dd>
                      <dd><a href="">跳转</a></dd>
                    </dl>
                  </li>
                  <li class="layui-nav-item">
                    <a href="javascript:;">解决方案</a>
                    <dl class="layui-nav-child">
                      <dd><a href="">移动模块</a></dd>
                      <dd><a href="">后台模版</a></dd>
                      <dd><a href="">电商平台</a></dd>
                    </dl>
                  </li>
                  <li class="layui-nav-item"><a href="">产品</a></li>
                  <li class="layui-nav-item"><a href="">大数据</a></li> -->
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